Small amount of urine that dribbles out of one's penis and onto one's underwear within moments of a post-urination sheathing of the penis. Immune to any of a variety of vigorous and/or embarassing shaking techniques.

It's derivation is that of a portmanteau between "prick" and "dribble."

I got a little pribble going on here, my friend, so I'm going to walk around the office a bit until it dries off.